I exited 1-90 heading toward Roslyn. The speed limit sign is placed within 15 feet of the off-ramp, and I missed it when I made a right turn north. I was going 45-50 mph or so, which is normal for a highway like that, when he jumped out from the side of the road on foot and motioned me over. I did not admit fault and he claimed I was going 59 in a 35. He wrote the ticket for 59 ($245) and when I asked to see the Radar, as I had nothing to go on, but his word, he said "no". I asked again and he said he can't do that. I then drove onto the highway, and as I pulled out, I saw a 50 mph speed limit sign 200 feet ahead.